Unit Components; Performance Data - General; General Performance Data - Model Ptp - Modine Manufacturing PTP Installation And Service Manual

ConTrol oPerATIng seQuenCe / unIT ComPonenTs
ConTrol oPerATIng seQuenCe
Upon a call for heat from the thermostat, power is supplied to
the power exhauster motor. The unit will go through a purge
period and then the direct spark igniter will be energized. At the
same time, the main valve in the combination control valve will
open to allow gas to flow to the burners. If the fan motor has
figure 15.1 - major gas, electrical service, safety
and other Components
8
1
9
2
5
4
3
1. Power Exhauster
2. Pressure Switch
3. Integrated Direct Spark
Control Board
4. Combination Gas Control
5. Control Transformer

generAl PerformAnCe dATA - model PTP

Table 15.1 - Propeller unit model PTP general Performance data
Btu/Hr Input ➀
Btu/Hr ouput ➀
entering Airflow (Cfm) @
70°f
outlet velocity (fPm)
Air Temp. rise (°f)
max. mounting
Height (ft.) ➁
Heat Throw (ft.) (@
max mtg Ht)
motor Type ➂
motor HP
motor rPm
6
8
7
6. Flame Sensor (hidden)
7. Auto Reset Limit Control (hidden)
8. Direct Spark Igniter (hidden)
9. Gas Pipe Connection
1 0. Horizontal Air Deflector Blades
model PTP sizes
150 175 200
150,000 175,000 200,000 250,000 300,000 350,000 400,000
120,000 140,000 160,000 200,000 240,000 280,000 320,000
2140 2725 2870
711 607 643
53 48 52
15 14 15
51 50 53
PSC PSC PSC
1/6 1/6 1/3
1075 1075 1075
not already started it will start shortly. If a flame is not sensed
within 7 seconds for any reason the main valve will close and
there will be a short purge period before ignition is tried again.
If the flame is not sensed after four tries there will be at least a
one hour wait before ignition is tried again.
Table 15.1 - gas Controls - All models
Control system description
single-stage, direct spark
10
Ignition, 100% shut-off with
Continuous retry
Utilizes a single-stage
combination gas control with
ignition control.
Gas is lit with a direct spark
igniter on call for heat.
Two-stage, direct spark
Ignition, 100% shut-off with
Continuous retry
Utilizes a two-stage combination
gas control with built-in ignition
control. Firing rate is 100% and
50% of full rated input. Gas is lit
with a direct spark igniter on call
for heat.
250 300 350 400
3995 4545 5280 5995
721 824 748 851
47 50 50
18 19 18
62 69 65
PSC PSC PSC PSC
1/3 1/2 1/2 3/4
1075 1075 1125 1125
6-560.4
gas Control
Type Code
Natural 11
Propane 21
Natural 12
Propane 22
 Ratings shown are for elevations up to 2,000'. For
elevations above 2,000', ratings should be
reduced at the rate of 4% for each 1,000' above
sea level. (In Canada see rating plate.) Reduction
51
of ratings requires use of a high altitude kit.
‚ Data taken at 55°F air temperature rise. At 65°F
21
ambient and unit fired at full-rated input. Mounting
height as measured from bottom of unit, and
without deflector hoods. For units equipped with
74
deflector hoods, see page 16.
ƒ All motors used are produced, rated and tested by
reputable manufacturers in accordance with
NEMA standards and carry the standard warranty
of both the motor manufacturer and Modine. All
motors are totally enclosed and all single phase
motors have built-in thermal overload protection.
Control service
voltage voltage
24V 115V
15